Casio · Manufacturer image
Casio
Casio F-91W
F-91W-1
The digital watch everything else is measured against: 21 grams, a seven-year battery and a shape that has not changed since 1989.
Typical street price
$30
Our editorial estimate, not a live retailer price.
Selection Time is reader-supported. If you buy through a link on this page we may earn a commission. This never affects our scores or what we recommend.
At a Glance
- Quartz movement — ±30 seconds per month (Casio specification)
- Date display
- Day of the week
- Alarm
- Stopwatch
- Digital display with backlight
- Resin glass crystal
Specifications
- Brand
- Casio
- Movement
- Casio digital quartz module, battery, approximately 7 years on a CR2016 (Casio specification) of power reserve, rated ±30 seconds per month (Casio specification)
- Case
- Resin, 8.5 mm thick, 38.2 mm lug-to-lug
- Crystal
- Resin glass
- Bracelet / strap
- Resin strap
- Water resistance
- Water Resistant (Casio publishes no depth rating)
- Dial colours
- Black
- Style
- Digital, Everyday
- Recommended wrist
- Small, Medium
- Country of origin
- Japan
What we like
- 21 g on the wrist and 8.5 mm thick — the closest a watch gets to wearing nothing
- Seven years on one CR2016, so it is genuinely maintenance-free
- ±30 seconds a month, an order of magnitude tighter than any mechanical watch here
- Alarm, hourly signal, 1/100 stopwatch with split timing and an auto-calendar
Full specifications
- Brand
- Casio
- Model
- F-91W
- Reference
- F-91W-1
- Collection
- Not published
- Typical street price
- $30
- MSRP
- $30
- Movement type
- Quartz
- Movement
- Casio digital quartz module
- Caliber
- Not published
- Power reserve
- Battery, approximately 7 years on a CR2016 (Casio specification)
- Stated accuracy
- ±30 seconds per month (Casio specification)
- Balance spring
- Not published
- Case width
- 35.2 mm
- Case thickness
- 8.5 mm
- Lug-to-lug
- 38.2 mm
- Lug width
- Not published
- Weight
- 21 g
- Case material
- Resin
- Crystal
- Resin glass
- Water resistance
- Water Resistant (Casio publishes no depth rating)
- Dial colours
- Black
- Bracelet / strap
- Resin strap
- Bracelet material
- Resin
- Clasp
- Not published
- Date
- Yes
- GMT
- No
- Chronograph
- Yes
- Style
- Digital · Everyday
- Recommended wrist
- Small · Medium
- Country of origin
- Japan
- Released
- 1989
- Selection Score
- Not published
Where to Buy
Selection Time is reader-supported. If you buy through a link on this page we may earn a commission. This never affects our scores or what we recommend.
- Check Price on Amazon
Amazon
Price shown on Amazon
- View at Casio
Casio
Not published
Watch Brands: Casio
Casio approaches watches as electronics rather than jewellery, and the result is a catalogue where a $60 watch can carry a 200 m rating and a screw-down crown.
